JPS5850024A - Shift fork made of aluminium alloy - Google Patents

Abstract

PURPOSE:To obtain a high-quality shift fork, by packing a high Si-Al alloy having high wear resistance into a part of the sliding part of a shift fork, which is made of an Al alloy die casting, through a through-hole. CONSTITUTION:Columnar parts 3 made of a high Si-Al alloy having high wear resistance are provided in sliding parts 2 of a shift fork makin body 1 made by die casting. This shift fork main body 1 is made of an alluminium alloy for die casting and is provided with pins 6 and 7 in parts corresponding to parts 3. Consequently, when die casting is performed with dies 4 and 5, the shift fork main body 1 provided with through-holes 8 corresponding to parts 3 is obtained. A heated pin-shaped high Si-Al alloy 9 is inserted into through-holes 8, and the through-holes 8 are packed immediately by pressurizing press.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an aluminum alloy shift fork that is a transmission component.

Shift forks used in automobile transmissions need to have appropriate strength, toughness, and wear resistance, and attempts have been made to manufacture them from aluminum alloy in order to further reduce weight. Therefore.

Considering productivity, aluminum alloy for die casting 1
For example, ^0010. ADOI 2 (JI8 H53
It is conceivable to make a shift fork product by mold casting using 02) and finishing processing to a predetermined dimensional accuracy.

However, this aluminum alloy for die casting has the drawback of not having sufficient wear resistance. Overcoming the drawback of lack of wear resistance If the shift fork is made of a high silicon aluminum alloy with good wear resistance (for example, 390 alloy of aluminum standard), there are problems with machinability and toughness.

It is an object of the present invention to provide a shift foil that can withstand practical use by combining the above-described aluminum alloy for die casting and a high-silicon aluminum alloy.

This purpose can be achieved by a shift fork made of a die-cast aluminum alloy, in which a high-silicon aluminum alloy columnar part with good wear resistance is provided in a part of the sliding part of the shift fork, passing through the shaft fork. .

JI8 H2BO for aluminum alloy for die casting
3 is preferred, ADOIO and 12 are preferred. For example, 6 is 390 (A^ standard) as a high-silicon aluminum alloy.

Mahle 138. K8280 or the like can be used.

High-silicon aluminum alloys have a silicon content of 12 or more, and copper, nickel, manganese, magnesium, etc. are added in consideration of wear resistance and high temperature strength.

The invention will be explained by way of example embodiments in conjunction with the accompanying drawings.

FIG. 1 is a schematic plan view of an aluminum alloy shift fork according to the present invention, in which the sliding part 2 of the shift fork body l made by die casting is made of a high-silicon aluminum alloy with good wear resistance (for example).

390 (A^ standard)) is provided as shown in the cross-sectional view of FIG. The shift fork body l is made of commonly used die-casting aluminum alloy 1.
For example, ADCIO or ^D012. Strength and toughness as a shift fork is ADOIO or 12
The shift fork is made of a die-casting aluminum alloy, and the sliding part 2 includes the wear-resistant columnar parts 3, thereby providing wear resistance as a shift fork. The high-silicon aluminum alloy of the columnar part 3 has poor machinability, but the cutting area is small, so this is not much of a problem.The shape of the columnar part 3 is designed to prevent falling out, facilitate manufacturing, and improve the shape of the shift fork body. In consideration of mold casting, etc., it is desirable to have both ends K-shaped like a "countersunk head" (see Figure 2).

The aluminum alloy shift fork according to the present invention can be manufactured as follows.

Molds 4 and 5 that form the cavity of Shift 7 oak products
In Fig. 3), pins 6 and 7 are provided in the portion corresponding to the columnar part 3 described above, so that this mold 4
．． When die casting is performed using 5, the columnar part 3
A shift fork body 1 having nine through-holes 8 corresponding to the above is obtained (FIG. 4).

In order to fill this through-hole 8 with a high-silicon aluminum alloy having good wear resistance, it is necessary to heat it to, for example, 30G to 400°C and insert a pin-shaped high-silicon aluminum alloy 9 into the through-hole 8 (Fig. 5). .

Pressure is immediately applied to fill the through hole 8 as shown in FIG. Alternatively, it is also possible to directly inject molten high-silicon aluminum into the through hole 8, solidify it, and fill it. Finally, finish processing is performed to a predetermined accuracy to complete the shift fork with the specified dimensions.

Placing a high-silicon aluminum alloy in the sliding parts where wear resistance is required makes it possible to manufacture the shift fork using a widely used die-casting aluminum alloy.

[Brief explanation of the drawing]

Figure @1 is a schematic cross-sectional view of an aluminum alloy shift fork according to the present invention. FIG. 2 is a sectional view taken along line A-A in FIG. 1. FIG. 3 is a partial sectional view of a mold used for manufacturing the shift fork according to the present invention. FIG. 4 is a partial sectional view of the shift fork after mold casting, and FIGS. 5 and 6 are partial sectional views of the Shift 7 oak explaining the process of filling the through hole with high silicon aluminum alloy. . 1...Shift fork body, 2...Sliding surface, 3...
・High-silicon aluminum alloy columnar parts, 4.5...
Mold, 6.7... bottle, 8... through hole. Patent Applicant Toyota Motor Corporation Patent Application Agent Patent Attorney Akira Aoki Patent Attorney Kazuyuki Nishidate 1) Yukio Patent Attorney Akira Yamaguchi Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 11';

Claims (1)

[Claims] 1. In a shift fork made of die-cast aluminum alloy, which is a transmission-impairing part. 1. A shift fork made of an Al-onium alloy, characterized in that a high-silicon aluminum alloy columnar part with good wear resistance is provided in a part of the sliding portion of the shift fork, penetrating the shift fork.